I saw that PSU 9343627 was released and gave it a whirl. I was a little confused when the README seemed to contain a lot of instructions that always assumed it to be on a clustered, RAC install. My setup was a single-instance Grid Infrastructure installation just to provide ASM. I soon met problem upon problem when going through first this setup step. I decided to try the PSU anyway, thinking Oracle would certainly have noted in the README if this was a problem for single-node installations. Turns out I was wrong.

The process for applying a patch on top of the CRS, or now called, the Grid Infrastructure, has changed from what we used to do on 11gR1 and prior releases. The patch I had recently applied was in order to resolve the Oracle bug “11.2.0.1 ONS CORE DUMP or High Resource Usage [ID 988795.1]”. Due to the fact that the patch doesn’t require full downtime and could be applied on a rolling basis, the plan below is to be executed on each node at time.

One of the most critical skills of any Oracle DBA is the ability to prevent a system crash and to restore and recover the system in case of a disaster. The “Oracle RMAN 11g Backup and Recovery” book by Robert G. Freeman and Matthew Hart is a resource that can definitely help to acquire the skill. I recently received my early copy of it, and am honored to have contributed to Chapter 5 “Oracle Secure Backup” for it.

I want to post the slides of the two presentations I did. My first presentation was a double slot session about Oracle Clusterware internals. My second presentation was about how we designed and run 1TB MySQL database in high availability setup.

I have successfully compiled and installed DBD::Oracle on Windows 2008 Server 64bit operating system today. I used the latest version of DBD::Oracle 1.24, version 11.2.0.1.0 for 64bit Windows of Oracle’s Instant Client Package – Basic along with the Instant Client Package – SQL*Plus and finally the Instant Client Package – SDK. Here are some instructions that will help with the install.

Recently I’ve been puzzled with the performance difference observed between 11GR1 and 11GR2. As part of the investigation I’ve decided to compare session stats from both 11GR1 and 11GR2 and found that there is a big difference for session cursor cache hits. But the number of session cursor cache hits I’ve been observing in 11GR2 just didn’t made any sense while being absolutely fine in 11GR1. An overflow was certainly a possibility, though in 2010, it’s not like someone should be counting every bit especially if they didn’t in 11GR1! Anyway it was worth a shot so I’ve decided to check it out…

It’s a busy time of year for Pythian. With many of our team tied up on client engagements, away at MySQL conference this week, and Collaborate 2010 next week, I’m pinch hitting as volunteer editor in helping to pull together this week’s edition of Log Buffer. Enjoy!

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